The straw bale library is now pretty much indistinguishable from the rest of the house, except for its very very thick walls. The exterior was finished much as the rest of the house was finished. First there was a scratch coat (although this one was thicker than elsewhere in the house to account for the (surprisingly small) unevenness in the straw. Then the brown coat and the color coat were applied exactly the same as it was elsewhere on the house.
Inside, the straw got a structolite “scratch coat” which is a light weight, but very hard plaster. That coat was then followed by a smooth plaster coat. The final coat will unify the plastered straw bale walls with the drywall in the upper soffit and ceiling.